How does a "script" differ from a "program" or "subroutine"?

[Colin J. Williams]

Dennis Lee Bieber wrote:
[snip]
> 	And to confuse the matter, the old FORTRAN terminology (at
> least, in my old classes) referred to "function subprograms" and
> "subroutine subprograms".
> 
Yes, because the former returned a value, the latter did not.

Colin W.